Connected: An Internet Encyclopedia
RFC 1123 - 6.1.2.1 Resource Records with Zero TTL: RFC-1035 Section 3.2.1

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### 6.1.2.1 Resource Records with Zero TTL: RFC-1035 Section 3.2.1

All DNS name servers and resolvers MUST properly handle RRs with a zero TTL: return the RR to the client but do not cache it.

DISCUSSION:

  Zero TTL values are interpreted to mean that the RR can only be used for the transaction in progress, and should not be cached; they are useful for extremely volatile data.

Next: 6.1.2.2 QCLASS Values: RFC-1035 Section 3.2.5

Connected: An Internet Encyclopedia
RFC 1123 - 6.1.2.1 Resource Records with Zero TTL: RFC-1035 Section 3.2.1